Abstract
Dielectric relaxations and d.c. conduction in poly(ethylene terephthalate)(PET) were studied from the point of view of how types and concentration of catalysts used in polymerization affect these electrical properties. D.C. conductivity in PET is affected considerably by the use of catalysts; that is, residual catalysts themselves are ionized in the polymer and contribute to d.c. conduction. On the other hand, from the evidence that the dielectric α-relaxation process is scarcely affected by catalysts but that the dielectric β-relaxation process is separated into two modes by the use of catalysts, it is concluded that the molecular structure of PET is scarcely affected by catalysts as a whole, but might be changed in local structures, such as chain ends. The molecular mechanisms of the β-relaxation in PET are attributable to the local oscillations of frozen-in main chains and the hindered rotations of the terminal carboxyl groups.
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Sasabe, H., Sawamura, K., Saito, S. et al. Effects of Catalysts on Dielectric Properties and D. C. Conduction in Poly(ethylene terephthalate). Polym J 2, 518–529 (1971). https://doi.org/10.1295/polymj.2.518
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DOI: https://doi.org/10.1295/polymj.2.518
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